#include "STC89C5xRC.H"
#define u8 unsigned char 
#define u16 unsigned int

void main()//
{
	u16 a,b;
	while(1)
	{
		for(a = 0;a < 20000;a++)
			 for(b = 0;b < 10;b++);
		P1 = ~P1;
	}
}


